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In case anyone is interested,
I placed the description of an exam
question on my web space that deals with space-time diagrams. The
question allows me to see in a hurry if the students understand what
they're doing or not.
Although I have gone over this in class, I am sad to report that I
generally find only 30% to 50% of my students can do this correctly on
the final exam.
The next time I teach this course I
will put more emphasis on "contours of constant value,"